Why can't I use Visual Studio 2015?
This might sound a bit daft, but the reason you cannot use it is because it is not yet supported. As simple as that. Support is coming though, but it doesn't look like it will be production-ready for the official 4.9. So... maybe 4.10 or later.
Read more about it here: https://forums.unrealengine.com/showthread.php?77332-UE4-and-Visual-Studio-2015
and here (last paragraph in first post): https://forums.unrealengine.com/showthread.php?78220-Unreal-Engine-4-9-Preview
answered Aug 02 '15 at 11:20 AM
Follow this question
Once you sign in you will be able to subscribe for any updates here